Patchouli tea

My wife (the tea lover in this family) is growing a patchouli tree, and would like to make some tea from it. I can find only 1 hit on Google (is this a record?) and that is a rather dubious-looking mention with no actual information . . . so does anyone know if you can make patchouli tea, and if so how (and is it safe to drink it, I wonder?)

"Patchouli is an herb that has been used for its medicinal qualities since ancient times. It has been used to treat colds, diarrhea, indigestion and skin problems. Dried patchouli leaves can even be used as an insect repellent. Using patchouli is simple and inexpensive, according to patchouli enthusiasts."

My own plant is HUGE and I have yet to make a large harvest but after reading this I think it's time.